How many different flags can be made from colors red, yellow, blue, green, white so that each flag consisted of three different colors?
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nice site helped me very much
This solution is for if the order of color matters. However, according to the question, order does not matter. It is therefore a combination, not a permutation. The solution should be (7x6x5)/3! = 35.
I think solution in OK, because order matters...
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